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require 'bigdecimal'
describe :bigdecimal_mult, shared: true do
before :each do
@zero = BigDecimal "0"
@zero_pos = BigDecimal "+0"
@zero_neg = BigDecimal "-0"
@one = BigDecimal "1"
@mixed = BigDecimal "1.23456789"
@pos_int = BigDecimal "2E5555"
@neg_int = BigDecimal "-2E5555"
@pos_frac = BigDecimal "2E-9999"
@neg_frac = BigDecimal "-2E-9999"
@nan = BigDecimal "NaN"
@infinity = BigDecimal "Infinity"
@infinity_minus = BigDecimal "-Infinity"
@one_minus = BigDecimal "-1"
@frac_1 = BigDecimal "1E-99999"
@frac_2 = BigDecimal "0.9E-99999"
@e3_minus = BigDecimal "3E-20001"
@e = BigDecimal "1.00000000000000000000123456789"
@tolerance = @e.sub @one, 1000
@tolerance2 = BigDecimal "30001E-20005"
@special_vals = [@infinity, @infinity_minus, @nan]
@regular_vals = [ @one, @mixed, @pos_int, @neg_int,
@pos_frac, @neg_frac, @one_minus,
@frac_1, @frac_2
]
@zeroes = [@zero, @zero_pos, @zero_neg]
end
it "returns zero of appropriate sign if self or argument is zero" do
@zero.send(@method, @zero, *@object).sign.should == BigDecimal::SIGN_POSITIVE_ZERO
@zero_neg.send(@method, @zero_neg, *@object).sign.should == BigDecimal::SIGN_POSITIVE_ZERO
@zero.send(@method, @zero_neg, *@object).sign.should == BigDecimal::SIGN_NEGATIVE_ZERO
@zero_neg.send(@method, @zero, *@object).sign.should == BigDecimal::SIGN_NEGATIVE_ZERO
@one.send(@method, @zero, *@object).sign.should == BigDecimal::SIGN_POSITIVE_ZERO
@one.send(@method, @zero_neg, *@object).sign.should == BigDecimal::SIGN_NEGATIVE_ZERO
@zero.send(@method, @one, *@object).sign.should == BigDecimal::SIGN_POSITIVE_ZERO
@zero.send(@method, @one_minus, *@object).sign.should == BigDecimal::SIGN_NEGATIVE_ZERO
@zero_neg.send(@method, @one_minus, *@object).sign.should == BigDecimal::SIGN_POSITIVE_ZERO
@zero_neg.send(@method, @one, *@object).sign.should == BigDecimal::SIGN_NEGATIVE_ZERO
end
it "returns NaN if NaN is involved" do
values = @regular_vals + @zeroes
values.each do |val|
@nan.send(@method, val, *@object).nan?.should == true
val.send(@method, @nan, *@object).nan?.should == true
end
end
it "returns zero if self or argument is zero" do
values = @regular_vals + @zeroes
values.each do |val|
@zeroes.each do |zero|
zero.send(@method, val, *@object).should == 0
zero.send(@method, val, *@object).zero?.should == true
val.send(@method, zero, *@object).should == 0
val.send(@method, zero, *@object).zero?.should == true
end
end
end
it "returns infinite value if self or argument is infinite" do
values = @regular_vals
infs = [@infinity, @infinity_minus]
values.each do |val|
infs.each do |inf|
inf.send(@method, val, *@object).finite?.should == false
val.send(@method, inf, *@object).finite?.should == false
end
end
@infinity.send(@method, @infinity, *@object).infinite?.should == 1
@infinity_minus.send(@method, @infinity_minus, *@object).infinite?.should == 1
@infinity.send(@method, @infinity_minus, *@object).infinite?.should == -1
@infinity_minus.send(@method, @infinity, *@object).infinite?.should == -1
@infinity.send(@method, @one, *@object).infinite?.should == 1
@infinity_minus.send(@method, @one, *@object).infinite?.should == -1
end
it "returns NaN if the result is undefined" do
@zero.send(@method, @infinity, *@object).nan?.should == true
@zero.send(@method, @infinity_minus, *@object).nan?.should == true
@infinity.send(@method, @zero, *@object).nan?.should == true
@infinity_minus.send(@method, @zero, *@object).nan?.should == true
end
end
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